//创建请求msg后，设置header
MimeHeaders headers = soapMsg.getMimeHeaders();
heders.addHeader("Accept-Encoding", "gzip,deflate");


//调用
SOAPMessage response = conn.call(soapMsg, url);

//解压数据
ByteArrayOutputStream out = new ByteArrayOutputStream();
response.writeTo(out);
byte[] barr = out.toByteArray();
InputStream gzipStream = new GZIPInputStream(new ByteArrayInputStream(barr));
Reader decoder = new InputStreamReader(gzipStream, "UTF-8");
BufferedReader buffered = new BufferedReader(decoder);
int n = 0;
char[] cbuf = new char[1024];
Writer w = new StringWriter();
while ((n = buffered.read(cbuf)) != -1) {
    w.write(cbuf,0,n);
}
//得到字符串
System.out.println(w.toString());